The feeling of hunger in the stomach just after eating is commonly found in the body of patients with hypermetabolic diseases, such as hyperthyroidism and diabetes. People who experience hunger in the stomach just after eating should go to the hospital for endocrine examination, and the symptoms are directly related to hypermetabolic diseases. Hyperthyroidism will cause the thyroid gland to secrete too much hormone because it is in a state of sympathetic excitement, the speed of food digestion will be affected, and the food will be metabolized faster just after eating because of sympathetic hyperactivity, which is manifested as feeling just after eating. The main symptoms of diabetes are three more and one less. Patients will show that they drink more, eat more and urinate more. Patients will feel hunger faster because the body’s energy consumption is faster. Hypermetabolic diseases should be treated promptly after diagnosis, otherwise they will induce other complications to appear.